Statement Of Changes In Equity [Abstract]
| Concept |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2024-01-01 to 2024-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
2023-01-01 to 2023-12-31 |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Statement of changes in equity [abstract] | ||||||||||||||||
| Statement of changes in equity [line items] | ||||||||||||||||
| Dividends recognised as distributions to owners of parent |
–
GBP
|
–
GBP
|
248,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
248,200,000
GBP
|
248,200,000
GBP
|
–
GBP
|
–
GBP
|
176,600,000
GBP
|
–
GBP
|
176,600,000
GBP
|
–
GBP
|
176,600,000
GBP
|
–
GBP
|
| Dividends recognised as distributions to non-controlling interests |
31,400,000
GBP
|
–
GBP
|
31,400,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
16,000,000
GBP
|
16,000,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Increase (decrease) through acquisition of subsidiary, equity |
518,900,000
GBP
|
–
GBP
|
477,200,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
41,700,000
GBP
|
41,700,000
GBP
|
–
GBP
|
–
GBP
|
92,300,000
GBP
|
92,300,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
| Increase (decrease) through disposal of subsidiary, equity |
121,800,000
GBP
|
–
GBP
|
122,600,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
800,000
GBP
|
800,000
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through transfer between revaluation surplus and retained earnings, equity |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
4,000,000
GBP
|
4,000,000
GBP
|
–
GBP
|
— | — | — | — | — | — | — | — |
| Increase (decrease) through exercise of options, equity |
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
12,900,000
GBP
|
12,900,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
11,100,000
GBP
|
–
GBP
|
–
GBP
|
11,100,000
GBP
|
| Increase (decrease) through transactions with owners, equity |
2,200,000
GBP
|
–
GBP
|
1,600,000
GBP
|
–
GBP
|
–
GBP
|
600,000
GBP
|
–
GBP
|
600,000
GBP
|
–
GBP
|
–
GBP
|
4,700,000
GBP
|
3,600,000
GBP
|
8,300,000
GBP
|
–
GBP
|
8,300,000
GBP
|
–
GBP
|
| Purchase of treasury shares |
–
GBP
|
–
GBP
|
5,400,000
GBP
|
–
GBP
|
–
GBP
|
5,400,000
GBP
|
–
GBP
|
5,400,000
GBP
|
–
GBP
|
–
GBP
|
4,800,000
GBP
|
–
GBP
|
–
GBP
|
–
GBP
|
4,800,000
GBP
|
4,800,000
GBP
|